thanks but no change...

I would check the computer for any spyware. These cases may help,
Networking No new posts, Solved: SonicWall Firewall down every 5 minutes, 0, chicagotech, 11, Sat Feb 10, 2007 4:23 pm chicagotech · View latest post ...
http://www.chicagotech.net/netforums/viewforum.php?f=1&sid=734d756fd57a6cd819a099710644fb8e
Slow Internet Access Slow Internet Access - Case Study. Situation: The client reported that their access to the Internet very slow while the LAN speed seemed OK. ...
http://www.chicagotech.net/Security/slowintrenet1.htm
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com
I have aa Windows 2003 server and 30 clients (domain)...
The whole network section (switch) is dropping when a client computer
hangs...
any idea ?
Also have intermitent network drops (couple of secs)...